equalsExact

Returns true if geometries a and b are of the same type and have the same vertices in the same order on the XY plane.

Vertices are checked by index so any additional midpoint or reversed order results in the geometries not being considered equal.

Vertices are compared only by their X and Y values, Z and M values are ignored.

Parameters

Name	Type	Description
a	Geometry	First geometry
b	Geometry	Second geometry
tolerance	number	Tolerance to determine vertex equality

Returns

boolean

true if geometries a and b are of the same type and have matching vertices

See also

• equals checks if two geometries are topologically equal
• equalsIdentical checks whether two geometries are of the same type and have exactly the same vertices in the same order on the XYZM plane
• GeometryRef#normalize normalized geometries are easier to compare

Examples

const a = lineString([ [ 0, 0, 100 ], [ 8, 0, 101 ] ]);

// only XY are compared
const t1 = equalsExact(a, lineString([ [ 0, 0 ], [ 8, 0 ] ]), 0);
// Z and M are ignored
const t2 = equalsExact(a, lineString([ [ 0, 0, 100 ], [ 8, 0, 102 ] ]), 0);
// with a tolerance
const t3 = equalsExact(a, lineString([ [ 0, 0 ], [ 7.9999, 0 ] ]), 0.001);

// wrong type
const f1 = equalsExact(a, multiLineString([ [ [ 0, 0 ], [ 8, 0 ] ] ]), 0)
// extra midpoint
const f2 = equalsExact(a, lineString([ [ 0, 0 ], [ 4, 0 ], [ 8, 0 ] ]), 0)
// reversed order -> wrong first point
const f3 = equalsExact(a, lineString([ [ 8, 0 ], [ 0, 0 ] ]), 0);

const a = lineString([ [ 0, 0, 100 ], [ 8, 0, 101 ] ]); // only XY are compared const t1 = equalsExact(a, lineString([ [ 0, 0 ], [ 8, 0 ] ]), 0); // Z and M are ignored const t2 = equalsExact(a, lineString([ [ 0, 0, 100 ], [ 8, 0, 102 ] ]), 0); // with a tolerance const t3 = equalsExact(a, lineString([ [ 0, 0 ], [ 7.9999, 0 ] ]), 0.001); // wrong type const f1 = equalsExact(a, multiLineString([ [ [ 0, 0 ], [ 8, 0 ] ] ]), 0) // extra midpoint const f2 = equalsExact(a, lineString([ [ 0, 0 ], [ 4, 0 ], [ 8, 0 ] ]), 0) // reversed order -> wrong first point const f3 = equalsExact(a, lineString([ [ 8, 0 ], [ 0, 0 ] ]), 0);